A certain cell type has existed in the blood and tissue of its vertebrate host's immune system for over twenty years. One day, it recognizes a newly arrived antigen and binds to it, subsequently triggering a secondary immune response in the body
Which of the following cell types most accurately describes this cell?
A) plasma cell
B) thyroid cell
C) memory cell
D) macrophage
Answer: C
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In certain plants, some of the roots may be modified to carry out unusual functions. Which of these is not an example of one of these special functions?
A. help absorb oxygen B. store food or water C. carry out photosynthesis D. parasitize other plants E. discourage herbivores
Remote oceanic islands are characterized as having disharmonic biota, meaning the number and relative proportions of taxa living on the island differ significantly from the number and relative proportions of taxa on the nearest continental mainland
area. Each island system is disharmonic in its own unique way. Why?
Which of the following additives help preserve food as well as enhancing flavor?
A) cinnamon B) garlic C) salt D) salt and pepper E) cinnamon, garlic, and salt
Which of the following would be least accurate in detecting coliform bacteria in a water sample?
a) The presumptive MNP test b) The standard plate count c) The membrane filter method d) The confirmatory MPN test